Abstract
The core of many IoT systems is based on a network of electronic devices and connected sensors. In this special issue many researchers have proposed solutions to improve different aspects of communication and collaboration among connected devices. Some proposals improve physical aspects of the communication network, especially wireless networks. Other proposals are focused on improving the communication and allocation algorithms used by the IoT networks. There are also some critical services that could affect communications processes and can be optimized for different scenarios, like DNS. Related to services of connected devices, some researchers have proposed notable improvements to design new kind services. The interoperability among heterogeneous devices is one of the classic problems for many IoT systems, some authors have proposed frameworks which try to simplify the communication processes among heterogeneous devices. Including new kind of devices in loT systems is nowadays an important challenge, which could extend the applicability of loT in many new Industrial environments, some new ideas about this topic are proposed in this special issue. Finally, there is an important research line related to privacy and security in communications, there are some specific security and privacy problems when loT networks related to sensitive sensor data and connected devices security. (C) 2018 Published by Elsevier B.V.